CHAPTER 4 PORT FUNCTIONS
User’s Manual U16899EJ2V0UD
96
Figure 4-13. Block Diagram of P33
P33/INTP4/TI51/TO51
WR
PU
RD
WR
PORT
WR
PM
PU33
Alternate
function
Output latch
(P33)
PM33
Alternate
function
EV
DD
P-ch
Selector
Internal bus
PU3
PM3
PU3:
Pull-up resistor option register 3
PM3:
Port mode register 3
RD: Read
signal
WR
××
: Write
signal